From the IHT report:
The novelty began at the gate, which offered upper- and lower-deck access to the plane. Emirates, the largest customer for the A380, plans to put premium and economy-class seats on separate decks — as on an ocean liner — allowing people to board from their VIP lounges.
I can see a new version of Titanic in this. Except I guess I would generally feel safer on the lower deck this time (unless they had to evacuate the aircraft.)
But the crucial thing about long distance flight is the number of toilets:
Packed full of seats, the A380 can seat up 840 people. Airbus used this plane for evacuation drills last year, and it said all 840 were able to pile out in 78 seconds. It is not clear what would happen if they needed to use the toilet simultaneously.
Speaking of toilets, there were 15 on this A380, including one in the first-class cabin that has a window above the commode. Except for the view, its cramped confines did not invite loitering.Let's see, that is about one toilet for 56 people. Maybe even worse on the "economy" level. Can that be enough for a 840 person configuration?